These are the numbers I am working with and I need to know the pooled variance. I keep working the problem and I keep getting the wrong answer, please write the equation out so I can see where I am going wrong. SAMPLE 1: N=30 Mean=5.61 Variance=4.7981724 Standard deviation=2.1904731 Sum of squared=139.147 Sample 2: N=30 Mean=7.3266667 Variance=1.8558161 Standard deviation=1.3622834 Sum of squared=53.818667
Inverse Normal Distribution
The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of two parameters.
Mean, Median, Mode
It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency or measure of central tendency is a central or typical value for a probability distribution.
Z-Scores
A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow comparison between two scores that belong to different normal distributions.
These are the numbers I am working with and I need to know the pooled variance. I keep working the problem and I keep getting the wrong answer, please write the equation out so I can see where I am going wrong.
SAMPLE 1:
N=30
Mean=5.61
Variance=4.7981724
Standard deviation=2.1904731
Sum of squared=139.147
Sample 2:
N=30
Mean=7.3266667
Variance=1.8558161
Standard deviation=1.3622834
Sum of squared=53.818667
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